<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css" integrity="sha384-xOolHFLEh07PJGoPkLv1IbcEPTNtaed2xpHsD9ESMhqIYd0nLMwNLD69Npy4HI+N" crossorigin="anonymous">
</head>
<body>
   <!-- Button trigger modal -->

  <!-- Modal -->
  <div class="modal fade" id="exampleModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true">
    <div class="modal-dialog">
      <div class="modal-content">
        <div class="modal-header">
          <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
          <button type="button" class="close" data-dismiss="modal" aria-label="Close">
            <span aria-hidden="true">&times;</span>
          </button>
        </div>
        <div class="modal-body">
          ...
        </div>
        <div class="modal-footer">
          <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
          <button type="button" class="btn btn-primary">Save changes</button>
        </div>
      </div>
    </div>
  </div>
    <form>
        <div class="form-group">
          <label for="exampleInputEmail1">邮箱:</label>
          <input type="email" class="form-control" id="exampleInputEmail1" aria-describedby="emailHelp">
          <small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small>
        </div>
        <div class="form-group">
          <label for="exampleInputPassword1">密码:</label>
          <input type="password" class="form-control" id="exampleInputPassword1">
        </div>
        <div class="form-group form-check">
          <input type="checkbox" class="form-check-input" id="exampleCheck1">
          <label class="form-check-label" for="exampleCheck1">Check me out</label>
        </div>
        <button type="submit" class="btn btn-primary">Submit</button>
      </form>


      <div class="form-check form-check-inline">
        <input class="form-check-input" type="checkbox" id="inlineCheckbox1" value="option1">
        <label class="form-check-label" for="inlineCheckbox1">1</label>
      </div>
      <div class="form-check form-check-inline">
        <input class="form-check-input" type="checkbox" id="inlineCheckbox2" value="option2">
        <label class="form-check-label" for="inlineCheckbox2">2</label>
      </div>
      <div class="form-check form-check-inline">
        <input class="form-check-input" type="checkbox" id="inlineCheckbox3" value="option3" disabled>
        <label class="form-check-label" for="inlineCheckbox3">3 (disabled)</label>
      </div>


      <div class="alert alert-primary" role="alert">
        A simple primary alert—check it out!
      </div>
      <div class="alert alert-secondary" role="alert">
        A simple secondary alert—check it out!
      </div>
      <div class="alert alert-success" role="alert">
        A simple success alert—check it out!
      </div>
      <div class="alert alert-danger" role="alert">
        A simple danger alert—check it out!
      </div>
      <div class="alert alert-warning" role="alert">
        A simple warning alert—check it out!
      </div>
      <div class="alert alert-info" role="alert">
        A simple info alert—check it out!
      </div>
      <div class="alert alert-light" role="alert">
        A simple light alert—check it out!
      </div>
      <div class="alert alert-dark" role="alert">
        A simple dark alert—check it out!
      </div>

     
    <script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" ></script>
    <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js" ></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/js/bootstrap.min.js"></script>
    <button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal">
        Launch demo modal
    </button>
      

</body>
</html>